我的循环在 Javascript 中不起作用。 我必须遍历循环到数组并乘以 2

Question

hey guys i have problem with my exercise: "using a while loop, traverse the array and multiply each price by 2" i have this to now

 var prices = [10, 15, 25, 8, 4, 55, 99, 11, 15, 25, 5, 4, 65, 5, 10, 15, 7, 8, 4, 9, 100]; while (prices < 201) { console.log('This item costs', prices); prices * 2 }

I don't know where the error is?

Answer 1

Right now you are just doing for one element. In array you have to access element with their index number. The logic for doing is that you have to loop till the end of the array and for each element have to multiply the price by 2. I have attached the code below with proper logic.

 var prices = [10, 15, 25, 8, 4, 55, 99, 11, 15, 25, 5, 4, 65, 5, 10, 15, 7, 8, 4, 9, 100]; var i=0; //loop to double price of each element in the array while (i < prices.length){ prices[i]=prices[i]*2; i++; } console.log(prices);